I'm using the latest Omada controller software (v5.0.29). I just setup my new ER605 yesterday and wanted to configure the Mail Server options so that I get email notifications for certain alerts but when I send a test email to my Exchange 2016 server, which is on the same subnet and working perfectly, the controller instantly shows "Failed to send email to the specified recipient..." so it doesn't seem like it even tries since it's an instant error the second I click the Send button.

I've tested by sending an email from my pc with Outlook and also telnet and I'm able to send emails to this recipient just fine. No authentication needed although I tried specifying the credentials anyway. Tried SMTP as local ip and hostname. In Exchange I don't see any attempted connections when I try to send the test email from the controller.